Improvement in chills for casting mold-boards



if TA'IES PATENT GFFIon.

JAMES OLIVER, OF SOUTH BEND, INDIANA.

IMPROVEMENT IN CHILLS FOR CASTING MOLD-BOARDS.

Specification forming part of Letters Patent No. 118,237, dated March 3,1874; application tiled February 12, 1874.

CASE B.

.To all whom it may concern:

Be it known that I, JAMES OLIVER, of South Bend, in the county of St.Joseph and Stat-e ot' Indiana, have invented certain new and usefulImprovements in Chill for Casting Moldloards; and I do hereby declarethat the following is a full, clear, and exact description thereof, thatwill enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings and tothe letters of reference marked thereon, which form a part of thisspeciiication.

Vhen melted iron is poured into a flask containing a mold-board chillthe iron that is to form the face of the mold-board casting comes indirect contact with the chill, which rapidly cools the face cf thecasting, thereby chilling or hardening it to a greater or less depth.This chilling process contracts the face of the casting to the depth itis chilled more than the baci; of the casting which is not chilled, inconsequence of which the casting is sprung or warped out of shape, to agreater or less extent, depending on the depth to which the nieta-l ischilled-for instance, Aa mold-board that is chilled half through thethickness of the metal will warp more than one that is chilled twothirds through. This warping makes it difficult to tit chilledmold-boards to plow standards and points, and many are rendered unfitfor use after casting, while nearly all of them have to be ground,chipped, and tiled on the backs to make them fit properly before theycan be set up. To overcome this warping is the object of my invention;and to this end I insert metallic strips in the cope of the flask, so asto chill the mold-board at certain points entirely through the metal,.as will be hereinafter more fully set forth.

In the accompanying drawing, A represents the body of the iiask. B isthe cope thereof. G represents the chill, D the mold-board pattern, andb b the metal strips. After thepattern D is placed on the chill C, thecope B is put on, and a layer of sand sifted on the back of the patternabout one inch deep. Into this sand are forced thin strips, b b, otmetal edgewise, which strips are worked backward and forward until theiredges rest solid on the back of the mold-board pattern. These stripsshould be upon that part of the mold-board which restsl on the standardwhen set up for use. The cope is then lled up with sand tucked aroundthe metal strips and rammed in the usual manner. The cope is now liftedto remove the pattern, when the edges of the metal strips will be seenembedded in the sand and flush with it. When the melted iron is pouredinto the iiaslc the face of the casting is chilled by contact with theiron forming the face-chill,

and where the melted iron comes incontact with the strips b b it alsochills, thus chilling the mold-board entirely through the thickness ofthe metal at these points. This e'ectually prevents the mold-board fromtwisting or warping by separating in several sections that portion ofmetal which forms the back or unchilled part of the moldboards, so thatthe backs, instead of being in one piece to warp or twist by the unequalcontraction in cooling, the warp, twist, or strain is conned to thenarrow sections between the portions chilled clear through, therebybreaking the power of the strain which otherwise would twist thecastings out of shape.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is i Metallic strips b b, used incombination with a chill for casting mold-boards, for the purpose hereinset forth.

In testimony thatI claim the foregoing, I have hereunto set my hand this2d day of February, 1874.

JAMES OLIVER.

Witnesses:

O. H. WATSON, H. C. SCOTT.

